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A middle-aged loser travels back in time to his high scool years to put his life on the right track.

Although Kim Tak Gu is the illegitimate son of SAMHWA Enterprise's President, Goo In Jong and his mistress, he was made the successor of his father due to his extreme talent in baking. However, Tak Gu's inheritance rights were taken away due to a conspiracy planned by his father's legitimate wife and half-siblings. With his great determination to succeed and become the number one baker king in the baking industry, Tak Goo drives himself to rebuild his career from scratch. More hardships and pain comes along in his way as he strives harder to reach his goal when he is caught between two women. The first love who will betray him for her own interest and the other woman who will stand by him through everything despite being hurt.

Hee Tae met his future wife, Il Ri, when he worked as a temporary biology teacher at an all girls high school. Il Ri was a student there. Now, Hee Tae works as a fishery researcher and spends his days in a typical marriage. One day, he learns that his wife is having an affair with a carpenter. He becomes angry for the first time, but decides to keep his family and wife.